√(π-√17)^2

[Look at the photo for better understanding and quality]

What is the standard form of -5x^2+2x^4-11+x^3+3x

What is the total surface area of this square pyramid?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?